[svn-r26357] Added mapping example for the Excalibur detector use case.

1 files changed, 212 insertions, 0 deletions

diff --git a/examples/h5_vds-exc.c b/examples/h5_vds-exc.c
new file mode 100644
index 0000000..124d22b
--- /dev/null
+++ b/examples/h5_vds-exc.c
@@ -0,0 +1,212 @@
+/************************************************************
+
+  This example illustrates the concept of the virtual dataset.
+  Excalibur use case with k=2 and m=3.
+  This file is intended for use with HDF5 Library version 1.10
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE         "vds-excalibur.h5"
+#define DATASET      "VDS-excalibur"
+#define VDSDIM1         6 
+#define VDSDIM0         15 
+#define KDIM0           2 
+#define KDIM1           6 
+#define NDIM0           3 
+#define NDIM1           6 
+#define RANK            3 
+
+const char *SRC_FILE[] = {
+    "a.h5",
+    "b.h5",
+    "c.h5",
+    "d.h5",
+    "e.h5",
+    "f.h5"
+};
+
+const char *SRC_DATASET[] = {
+    "A",
+    "B",
+    "C",
+    "D",
+    "E",
+    "F"
+};
+
+int
+main (void)
+{
+    hid_t        file, space, ksrc_space, nsrc_space, vspace,
+                 src_space,
+                 dset;                       /* Handles */
+    hid_t        dcpl;
+    herr_t       status;
+    hsize_t      vdsdims[3] = {0,VDSDIM0, VDSDIM1},
+                 vdsdims_max[3] = {H5S_UNLIMITED,VDSDIM0, VDSDIM1},
+                 kdims[3] = {0, KDIM0, KDIM1},
+                 kdims_max[3] = {H5S_UNLIMITED, KDIM0, KDIM1},
+                 ndims[3] = {0, NDIM0, NDIM1},
+                 ndims_max[3] = {H5S_UNLIMITED, NDIM0, NDIM1},
+                 start[3],                   /* Hyperslab parameters */
+                 stride[3],
+                 count[3],
+                 block[3];
+    hsize_t      start_out[3],
+                 stride_out[3],
+                 count_out[3],
+                 block_out[3];
+    int          k = 2;
+    int          n = 3;
+    int          i;
+    H5D_layout_t layout;                     /* Storage layout */
+    size_t       num_map;                    /* Number of mappings */
+    ssize_t      len;                        /* Length of the string; also a return value */
+    char         *filename;
+    char         *dsetname;
+    hsize_t      nblocks;
+    hsize_t      *buf;                       /* Buffer to hold hyperslab coordinates */
+
+
+    file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /* Create VDS dataspace.  */
+    space = H5Screate_simple (RANK, vdsdims, vdsdims_max);
+    /* Create dataspaces for A, C, and E datasets. */
+    ksrc_space = H5Screate_simple (RANK, kdims, kdims_max);
+    /* Create dataspaces for B, D, and F datasets. */
+    nsrc_space = H5Screate_simple (RANK, ndims, ndims_max);
+
+    /* Create VDS creation property */
+    dcpl = H5Pcreate (H5P_DATASET_CREATE);
+     
+    /* Initialize hyperslab values */
+
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+    count[0] = H5S_UNLIMITED;
+    count[1] = 1;
+    count[2] = 1;
+    block[0] = 1;
+    block[1] = k;
+    block[2] = VDSDIM1;
+
+   /* 
+    * Build the mappings for A, C and E source datasets.
+    *
+    */
+   for (i = 0; i < 3; i++) {
+      start[0] = (hsize_t)((k+n)*i);
+      status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
+      status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i], SRC_DATASET[2*i], ksrc_space);
+   }
+
+   /* Reinitialize block[1] */
+   block[1] = n;
+   /* 
+    * Build the mappings for B, D and F source datasets.
+    *
+    */
+   for (i = 0; i < 3; i++) {
+      start[0] = (hsize_t)(k+(k+n)*i);
+      status = H5Sselect_hyperslab (space, H5S_SELECT_SET, start, NULL, count, block);
+      status = H5Pset_virtual (dcpl, space, SRC_FILE[2*i+1], SRC_DATASET[2*i+1], nsrc_space);
+   }
+
+   /* Create a virtual dataset */
+      dset = H5Dcreate (file, DATASET, H5T_NATIVE_INT, space, H5P_DEFAULT,
+                  dcpl, H5P_DEFAULT);
+      status = H5Sclose (space);
+      status = H5Sclose (nsrc_space);
+      status = H5Sclose (ksrc_space);
+      status = H5Dclose (dset);
+      status = H5Fclose (file);    
+     
+
+    /*
+     * Now we begin the read section of this example.
+     */
+
+    /*
+     * Open file and dataset using the default properties.
+     */
+    file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+    dset = H5Dopen (file, DATASET, H5P_DEFAULT);
+
+    /*
+     * Get creation property list and mapping properties.
+     */
+    dcpl = H5Dget_create_plist (dset);
+
+    /*
+     * Get storage layout.
+     */
+    layout = H5Pget_layout (dcpl);
+
+    if (H5D_VIRTUAL == layout) 
+        printf(" Dataset has a virtual layout \n");
+    else
+        printf("Wrong layout found \n");
+
+     /*
+      * Find number of mappings.
+      */
+     status = H5Pget_virtual_count (dcpl, &num_map);
+     printf("Number of mappings is %d\n", num_map);
+
+     /* 
+      * Get mapping parameters for each mapping.
+      */
+      for (i = 0; i < (int)num_map; i++) {   
+      printf("Mapping %d \n", i);
+      printf("         Selection in the virtual dataset \n");
+      /* Get selection in the virttual  dataset */
+          vspace = H5Pget_virtual_vspace (dcpl, (size_t)i);
+          if (H5Sget_select_type(vspace) == H5S_SEL_HYPERSLABS) { 
+              if (H5Sis_regular_hyperslab(vspace)) {
+                   status = H5Sget_regular_hyperslab (vspace, start_out, stride_out, count_out, block_out);
+                   printf("         start  = [%d, %d, %d] \n", (int)start_out[0], (int)start_out[1], (int)start_out[2]);
+                   printf("         stride = [%d, %d, %d] \n", (int)stride_out[0], (int)stride_out[1], (int)stride_out[2]);
+                   printf("         count  = [%d, %d, %d] \n", (int)count_out[0], (int)count_out[1], (int)count_out[2]);
+                   printf("         block  = [%d, %d, %d] \n", (int)block_out[0], (int)block_out[1], (int)block_out[2]);
+               }
+          }
+      /* Get source file name */
+          len = H5Pget_virtual_filename (dcpl, (size_t)i, NULL, 0);
+          filename = (char *)malloc((size_t)len*sizeof(char)+1);
+          H5Pget_virtual_filename (dcpl, (size_t)i, filename, len+1);
+          printf("         Source filename %s\n", filename);
+
+      /* Get source dataset name */
+          len = H5Pget_virtual_dsetname (dcpl, (size_t)i, NULL, 0);
+          dsetname = (char *)malloc((size_t)len*sizeof(char)+1);
+          H5Pget_virtual_dsetname (dcpl, (size_t)i, dsetname, len+1);
+          printf("         Source dataset name %s\n", dsetname);
+
+      /* Get selection in the source dataset */
+          printf("         Selection in the source dataset ");
+          src_space = H5Pget_virtual_srcspace (dcpl, (size_t)i);
+          if(H5Sget_select_type(src_space) == H5S_SEL_ALL) {
+                  printf("H5S_ALL \n");
+          }
+          H5Sclose(vspace);
+          H5Sclose(src_space);
+          free(filename);
+          free(dsetname);
+      }
+
+    /*
+     * Close and release resources.
+     */
+    status = H5Pclose (dcpl);
+    status = H5Dclose (dset);
+    status = H5Fclose (file);
+
+    return 0;
+}
+